by Tim Hunt.
45026 is not a number that grabs me. I would go for 44444 45000 or 50000, but if you are going to organise this, it is your call.
Anyone with a forum badge would work. A more relaxed option would just be to say anyone who has made a forum post.
I required people to send me a link with their entry (e.g. to a commit on github), so it was easy to verify.
In terms of organising, I just made a spreadsheet on google docs (not shared with anyone!) and listed the entries in there, so it was pretty easy. Well, I only got 5 entries, so it really was no effort.